View finder for cameras



H. A. MchcALLuM. VIEW FINDER FOR CAMERAS.

APPLICATION FILED IULY 3l, 1920.

1,437,765, Patented Dec. 5,1922.

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. H. A. McCALLuM.

VIEW FINDER FOR CAMERAS. APP'LlcATloN FILED JULY al, 1920.

1,437,765, Patented Dec. 5, 1922.

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H. A. MccALLuM.

VIEW FINDER FOR CAMERAS.

vAPPLICATION FILED :uw 31.1920.

Patented De@ 5,1922.

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vrnver simona .Application filed July 31,

To asl/1 "t0/wm it may concer/a:

Bc it known that Hicnnnn'r MCCAL- LUM, a citizenioil thev United States, and a` resident of Yonliermin the county of Vesty chester, State of New York, haveinvente'd certainnew and usefulv `lmprovements lin View Finders i"ior Cameraaof which the following s a specification.

This invention relates tocameialinders-` or thetype disclosed in .Patents Numbers 1,340,618 and 1,340,6l9 issued to inell/lay'l, 1920. The finders yillustrated and described in thesepatents are adapted to be', attached non onirniaas.r

1920K. `Serial No. 400,313.

ing novel means for v'erticaladjustment so that its outerend ymay be vertically adjusted at will; pivotally supportingfthe chin abutment and top plate upon the frame in such manner that vvhen folded to inoperative position the topk plate overlies and secures the chin abutment insuclr position, a single latch serving to, hold them in this position against the action of springs which return them to operativeposition immediately upon .the release ofthe latch; providing springs to the baclr oi a camera and are provided with abutnients against Whichthe. operator )laces his head which is thereb definitely,

positioned relative-ly to the camera and linder, l with one of ythe operators eyes aligned Witha vierv aperturethrough which are visible all objects in the field oi the` camera. Movement of the observcrs headk in seeking the desired view automatically points the camera and as soon as the observer can see the objects of Which he wishes to taire a picture, through tie view aperture, the ei;-

posure may be made. y

The objects of the p esent inventiton are to provide a view, iinder of this class having improvements which render it more easily adjustable to suit persons havingy different facial coniigurations,:more adaptable for at@ tachxnent to cameras otditlerent kinds, and generally more convenientin use.. These ob-k jects are realized byjthe incorporation ot a number of novel,eatureswvith the basic tentures of my prior invent-lons` the principal features of novelty consistingin 5- af special construction whereby the; finder ma y be secured topa camera having: anuutogra.-

phic window and/airemovable baclr vWithout i preventing the use of the windowforauto-k graphing purposesv or preventing the `removal ot the back` the entire inderbeing at the same time easily removable :tor vtranspfntation; improvednieans v*tor supporting the inder so that it `may be quickly and easily turned; iror the purpose of takingrpictrn'es with the long` anis ot theiilm either vertially or horizontally disposed; providing abutments or eye pieces :tor preventing latfor automatically moving the eye pieces from operative to inoperative positionwhen the hook members which secure these` abut ments in operative position are released, the springs serving also to maintain the eye piece hooks in locking engagement With cooperating catches on the top plate When the ieye pieces are in operative position; providing; novel means for .locking the rotatable disey in which the oblong View aperture is located Withits longitudinal axis either horirzontally or vertically disposed so that ythe longitudinal axis yof the view aperture is truly parallel vviththelongitudinal axis of the film; andarranging the holes in the perforated plate which covers the vieW aper ture in. a moreadvantageous manner so that very little of: the view is obstructed thereby ywhile its effectiveness kfor other purposes is i dotted. lines not'idecreased. y n o y y Other advantages and objects ofthe invention will be yappare-nt as it is disclosed in the following description when taken in connection With the in which n Figure l is a perspective view of a tolding camera as seen-from the rear and showing the finder attached thereto; e Figure 2 is a side view of the same, the outline of an observers face being shown in Figui-e3 isa viewof thefinder as seen troni the front, the .Finder having been detached from the camera and base plate;

Figure 1l is a rear-view ot a camera showing .the means for ,attaching the base plate f to ivnich the finder is secured eral movement ot the iinder with respect to 'K the head oi the observer which are, adjust#-` able vertically, laterally, and 'also `toward and avuiyfrom the plate in which the view aperture is located to accommodate different observers; providing a chin abutment hav- Figure :iis asection von line 5-5 of Figure f2; n

n Figure (3 is a vertical section through the finder infolded `or inoperative position;

Figure T is a section through a detail;

` Figure 8 is an elevation of a detail;

lr'gure 9 is a section on line 9*-9 of Fig accompanying drawings icc Figure 10 is a section on line 10-10 of Figure 6, and

Figure 11 is a section on line 1 1-11 o' Figure 3. l

lt will be understood that the finder may be applied to cameras of many types including moving picture machines, pocket cameras and cameras for use on tripods7 although it is particularly useful in connection with the usual small size camera. carried byhand from place to place and used principally in taking pictures with instantaneous exposure.

In the drawings the finder is shown attached to a camera having a back plate 10 formed in two similar portions the edges of which abut along line 10 and which are latched together' when the camera is in use but may be unlatched and drawn apart in removing the back. Secured to one section ot the back plate and adjacent the lower edge thereof are two headed pins or screws 11. A metal plate 12 is provided with key slots 13 adapted to receive the pins 11 and a latch 141 pivotally secured to plate 12, is adapted to be swung to the position shown in Fig, Si with its tree end engaging one oie. the pins 11 to lock the plate in position. he plate 12 however7 and the base plate 15 which is hinged thereto, may be removed from the camera whenever desired, by manipulating the latch 141. The base plate 15 supports the finder and is normally in the position indicated in dotted lines in Fig. e. with its spring latch 16 in engagement with a catch 17 secured to the back of the camera. The autographic feature of the camera is located in the area covered by the base plate and when it is desired to use this vfeature the base plate and inder attached thereto are swungl away from the camera back, and again returned to original position and secured by latch 16 when this operation has been completed. T he window in the back of the camera through whichthe numerals on the ilin are observed is indicated at 18 and a concealedv latch is indicated at 19 which is pressed when the operator desires to unlatch the halves of the back plate, tor the purpose ot'reinovi'ng the same. It has already7 been pointed out that the screws or pins 11. are both secured to the same portion ot the separable hack, and hence the iiiider docs not interfcire in anyvnianner with the removal of theback from the camera.`

The base plate 15 is provided with a eircula' aperture 20 and the .trame 21 ot thc` nder is provided with two hooks or lugs 23 adapted to extend around under the edge ot this circular aperture and to cooperate with the latch L in removably securing tue iinder to the base plate. Latch L isclearly illustrated in Figs. 6 and S and comprises a rotatable stem 25 extendingthrough a sleeve 26 rigidly secured to the trame 21 and is adapted to have limited longitudinal movement in said sleeve. To the upper end of stem 25 is secured lever 27 adapted to be grasped by the ingers to rotate the stem, and to its lower end is secured a segmental iange 28 having a beveled edge 29 which is adapted to ride over thc edge 300i' member 26 to cam the stem 25 downwardly, Figs. 6 and 6, against the tension of spring 31 which normally tends to maintain the stem in its uppermost position. 1n the attachment of the trame 21 to the base plate 15 the frame is superposed on the hase plate in such manner that hooks 23 extend under and engage the edge of circular aperture 2O and lever 27 rotated in a counter-clockwise direction from the position indicated in dotted lines in 1 to the position indicated in full lines in this figure'. In this rotation the segmental flange 28 will be moved from the position illustrated in Fig. 8 to the position illustrated in Fig. 6 in which the edge of base plate 15 is pinched between the lower edge of the sleeve 26 and the flange 2S. To attain this final position two cammina actions by the inclined face 29 ot the iiange 28 are necessary, the first causing it to ride over the edge 30 ot sleeve 26 and the second occurring when the inclined edge 29 strikes the edge of the aperture 20. The spring 31 is of such strength that the lever 27 is rictionally held against accidental rotation. 1t will be seen that the above construction permits the frame to be quickly and easily removed from the base plate and reattached.

ln the operation of the iinder it is desired that it be adjustable for taking pictures with the long axis oit the film either vertically or horizontally disposed. For this purpose the. traine may be rotated relative to the base plate.y the hooks 23 and the latch L beingr freely slidable along the edge ot' the base plate. Three holes 32 are made in the base plate which serve as catches Jfor a latch pin clearly illustrated in Fig. 7, which extends through the frame 15 and is nor-y inally forced downwardly by a dat spring 34C secured to the iframe. The three holes 32 are arranged 90v apart around the center of aperture 20, and when pin 33 is in engageinent with any one of these holes the finder is in operative position although it will be understood that in two ot these positions the frame member-21 having kthe `substantially triangular shape illustrated, atop plate 35 which is secured thereto by hinges 36, the

frame and top plate being adaptedy to fold together to inoperative position, or to be extended as illustratedy in Fig. 1. Springs 37 located at hinges 36 normally tend to throw the top plate `to open or operative position, and the rotation of plate 35 around the axis through hinges 36 is limited by the abutment of laterally extending flanges 38 and 39 on the frameand topf plate respectively. Abutments or eye pieces 40 of the type described in my prior patents mentioned are hinged at 41 to the opposite vertical edges ofthe top plate and springs 42 normallytend to swing these abutments fromv by tending to rotate these abutments to inoperative position also tend to maintain the hooks 43 in constant engagement with vthe catches 44 to prevent the accidental disen* gagement of the hooks.

Hooks 43 have threaded shanks 45 which engage the threaded inner wall of sleeves 46 secured to arms 47 which are in turn pivotally secured to the lower portions of eye pieces 40. Lock nuts 48 are provided on the shanks which are adapted to be forced against the edges of sleeves 46 to lock the shanks against rotation; The shanks 45 are threaded for the purpose of adjusting their lengths so that the abutments 4()` may be brought closer together or moved apart as desired, to accommodate observers whose heads are of different widths, the shoulders 49 of the abutments beingk adapted to rest against the forwardly facing outer edges of the eye sockets. l The end portions of the shanks 45k are yflattened on the sides as aty 50 (see Fig. and flat springs 51 secured to members 47 normally bear against therespective flattened portions of the shanks and cooperate with the lock nut in preventing accidental yrotation thereof. The kflattened faces, acting in vconjunction with the flat springs have additional functions, namely, to assist in properly positioning the hooks for engagement with the corresponding catches afterzthey have been adjusted forlength. To make an adjustment to one of the hooksit is only necessary to back off the lock nut 48 and rotate the hook and shank the desired number of turns in either direction. The iiat spring indicates when a ywhole number of turns has been made and the hook is facing the catch, and when the shankhas been lengthened orshortened; the desired distance the lock nut 48 is again brought into engagement with sleeve 46. An upward and downward adjustment of eye pieces or abutments 4O1may bey made by loosening wing nuts 52 which have threaded engagement with bolts 58 extending through abutments 40 and having headed ends 54, yBolts 53 extend through verticalslots 5 5 `in hinge plates 56, and, when the wing nuts have been loosened the abutments may be'moved vertically to the position desired,` the bolts sliding in slots 55, andthe abutments may be clampedin such vthe wing nuts; n

l ln order to providefor adjustment of the abutments 40 toward and from the top plate 3,5 a series of vertical slots 57 are provided in each, and laterallyextending flanges 58 of" hinge plates 56 are provided which are adapted to enter any pair` of these slots. This adjustment is made by looseningthe wing nuts 52 as before, so that the abutments ma be moved awa from thehin'e plates 56, and by then moving the abutments r toward and away from plate 35 untilflanges 58 may be inserted in the proper slots 57, Either abutment may be adjusted' verticallyy or horizontally independently of the other.

lSuitable circular apertures 59 are provided in the top plate and imperi-crate disc 60 and apertured disc 61 are positioned in these circular apertures, the discs being kinterchangeable so that the disc having the view aperture may be Plplaced opposite either eye ofthe observer. he disc receiving apertures in the plate 35 are countersunk, the

edge of the countersunkportion being indipositionby tightening f cated in dotted lines (Fig. 1) and the discs f are held in position against the countersunlr shoulders by the upper edges of plates secured firmly to the topy plate 35, the inner ends of which comprise catches 44, andby latches 62 normallypressed by springs 63 downwardly against pins or stops 64 secured j to the discs. The apertured disc 61 is provided with two pins 64 and this disc is rotatable relativelyto the plate so that the oblong sight opening or aperture 65 may have itslong axis either horizontally or vertically "disposed to be parallel with the longy axis of the camera film. The latches 62 are `notched at 66, the notches being adapted to receivepins 64 so that the disc 61 may be definitely located and locked in either of its positions. To vremove either disc from its seat it is only necessary to raise the latch Y the sight opening may be opposite either eye of the observer.

oblong aperture 67 and at the lower edge of this aperture is pivotally supported the chin abutment 68, a spring 69 normally tend The fra-nie 21 is provided with acentral All" ing to rotate this chin abut-ment to operative position as illustrated in F ig. l. The outer end of the chin abutment is adapted to bear against the lower portion of the observers face, as shown in Fig. 2, and to render the same adjustable it is provided with alongitudinally'movable plate 70 having a foot 7l adapted to bear against the frame l5 when in operative position, and having means for sliding this member relatively to the chin abutment. rl`his last mentioned means comprises a disc 72 fitting within a circular aperture in plate 70 and eecentrically pivoted on pin 73 which extends through the top of the chin abutment. Disc .72 has a. bottom flange integral therewith which is extended. to form an operating lever 7d. A llat spring 74 bears downwardly against the nut on pin 73 and upwardly on the operating lever, forcing the latter against plate 70 so that considerable force is needed to manipulate the lever, thereby insuring against accidental movement thereof. By swinging this lever around the pin 73 as a center the eef centric disc 72 is revolved to move the plate 70 forwardly or rearward y as desired to alter the angular position ot the abutment, the foot of the plate bearing againstfthe frame, when the abutment is in operative position.

To place the finder in inoperative position without disconnecting it from the camera the hooks 43 are released from catches la and the eye abutments allowed to swing behind the plate 35. The chin abutment 68 is then swung around its pivotal point against the action of spring G9 until it lies wthin the oblong aperture G7. rlhe top plate 35 is then rotate-d downwardly until the aperture 75 therein has passed over the upper end of catch 76 mounted on the frame, and the spring latch 77 mounted on the top plate has ent-ered the notch 78 in the pin. ln this position the top plate serves as securing means for the chin abutment, which has no independent securing means and upon release of the single latch 77 both the y top plate and the chin abutment automatically move under the influence, `of the springs, into operative position.

ln my prior Patent No, 1,340,619 l describe, illustrate and claim a plate hinged to the apertured disc and having a plurality of small perforations, the outer rows of which determine the outline of the y view visible to the observer, which is of the same shape as the exposure` aperture of the camera. rllhis plate has a number of advantages such as correcting for astigmatism of the observers eye and enabling the observer to rivet his attention on some particular object, visible through one of the small holes, so that he may hold his head perfectly still and take time exposures. For the latter purpose the central portion of the plate is imperforate, exceptifor. a holerlocatedl ex# actly in the center and exactly'in'frontofithe It is .c necessary f to provide such an imperforate areavso that thecenter-r observers eye.

hole may be distinguished'fromthe others,

but it is obvious that-a considerable portion:-A

of the view is obscured thereby.

s ln the present invention* 2li-.perforated plate 79 of this character is hinged tothe?" apertured .disc GlY in such; manner;thatity may bereadily swung awayfromgthisaaporr l.

ture if the observer desires an unobstructed.: view, a iiat spring SObeinggprovided havir'lg,A` portions adapted to` bear againstorf frick tionally engage the hinges oftheeplate'; Sf thatit will remain inanyvpositionto which it is turned. The lower portion of the-plate is turned outwardly so that it may be easily,-

grasped by t-he fingers of the operator. The

holes are all of the same size except the-.eight holes nearest the center hole; which` are,

smaller than the othersthefour quiteneary the center being the smallest of all.-

rlhis arrangement permits the operatortoU easily distinguish the-center hole, while-at. the same time a smaller portion of the View is obscured inasmuch as the-smaller central holes lessen the extent of the'imperforate area. By having the holes adjacent thevcenter hole much smaller than the `cente-rhole very little of the viewy is blocked andvyet the center hole is easily distinguishable..

from the others.

Numerous changes;` may be made in thefy design and arrangement yof the. parts-ofthe linder within the scope of the invention, which is not limited tothe precise .embodis ment disclosed.`

Having thus described Amy invention whatlv .l claim as new and ydesire to secure by. Letters Patenty is: l

l. In combination with a camera, aview finder which includes a frame adapted to be supported on the camera, achinl abutment, a plate having a view aperture, said".

finder which includes a frame adaptedto be.l

supported on the camera, a chin abutment, a plate having a view aperture, said chin abutment and plate being pivotally secured to the frame and each being adapted'to be folded relatively thereto to inoperative pos sition with the plate overlying and securing the chin abutment, a latch for holding said kplate in inoperative position and. spring means for automatically moving said abutr ment and plate to operative position upon the release ot' said latch.

3. ln combination with a camera, a View finder which includes a traine adapted to be supported on the camera, a chinl abutment hinged to said trame, a plate having a view aperture therein also hinged to said trame, said chin abutment and plate being adapted to be Jfolded relatively to the first ymentioned plate to inoperative position, with the second plate overlying and securing the. chin abutment, a latch for securing the plate in inoperative position, and springs located at the hinges ot said abutmentand plate respectively for automatically moving the same to operative position upon the release of said latch. n

4. ln combinationfwith a camera, a view finder including a plate having a view aperture, means constructed and arranged to hold the plate with the aperture in `iXed relation to one of the observers eyes including an abutment adapted to rest against the side' hold the lplate with the aperture in liXed relation to one of the observers eyes including an abutment adapted to rest against the side of theoperatorshead, said abutment being movable to either extended and operative or nested and inoperative position,-. a spring normallytending to move saidV abutment to inoperative position, and a device yfor `releasably securing'said abutment in operative position which comprisesy interlocking members on the abutment and plate normally held in engagementy by the tension of the spring. y n U 6. In combination with'a camera, a view finder including a plate having a viewy aperture, means constructed and arranged to hold the plate with the aperture, in fixed relation to one of the observers eyes including an abutment adapted to rest against the side of the observers head, said abutment being movable to either extended and operative or nested and 'inoperative position, al spring normally tending to move said abutment to inoperative position, a hook having a threaded 'shank' with a flattened portion, a

member attached to the abutment and having a 'threaded opening-.to receive said shank, whereby the distance of the yhook from the abutment may be adjusted` by rotating ythe shank, a catch secured to theplate, and a spring pressing against the shank and adapted to engage the flattened yportion thereof` ture, means I constructed and j designed to hold the platewith the aperture in iXed reable" means kfor, supporting said abutment lfinder including a plate having a view aperwhenthe hook has been turned to proper position to engage themcatch. i 7. l'n ycombination with a camera, a viewy finder including a plate havinga `view aperlation toene of the observers eyes including an abutment adapted to rest against the cuter margin of the eye socket, and adjust- 7 5' wherebythe distance between the `abutment and view aperture mai be varied alongl a line substantially normal to the plate.y

Y 8. in combinationywith a camera, a ,view

v so ture, means `constructed and designed to holdL the plate with the aperture in fixed relation to oneof the observers eyes including an abutmentadapted `torest yagainstthe outer vmargin of the eye socket, and adjustable means for supporting said abutment whereby the distancebetween theabutment and view aperture maybe varied,said means comprising a plate hinged to the` first mentioned plate and having aiiange adaptedto enterany one of a plurality of grooves in the abutment, andmeans for securing the abutment tothe plate. c v

k9. In combination with a camera, a view finder inclu'ding a plate having a view aperture, means yconstructed and designed to hold the plate withithe `aperture in liX'ed relation to one ont the observers eyes including, abutments adapted to rest againstthe outer margins yot the eye sockets, and adjustable means for ysupporting said abutments whereby `the distances between the `abutments yand plate .may bel varied, said means comprisingplates hinged to said iirst mentioned plates and having laterallyextending portions, the lateral extension of each plate being adapted to enter any one oii'a series of recesses in the` corresponding ,abutment,.and means for securing the abutment to the plate. v f

l0. ln combination with a camera, a view finder includingy a plate having a 4view aper- `ture,'means constructed and arranged to hold the yplate with the aperture in yfixedrelation to one ofthe eyes of the operator including van. abutment adapted to rest against the lower part or" the operators face, said abutment having an attachment for ad just-ing it vertically, said attachment com prising `a member vmovable longitudinally .of `the abutment and rotatable means tor saidI abutmenty having anl attachment 4Jtor 180 adjusting it relatively to the aperture which comprises a member movable longitudinally of the abutment and having a circular opening therein, a disc fitting in said opening and pivoted eccentrically to said abutment and a lever connected to said disc whereby the same may be rotated to move said mem- NDF 12. In a view finder of the class described, a plate having an aperture, a disc having a view opening rotatably mounted in said aperture, said disc also having a plurality of laterally projecting portions, and a spring latch pivotally mounted on the plate and adaptedk to engage any one of said projections to hold the disc against rotation.

13'. In a view nder of the class described, a plate having an aperture, a disc having a view opening and a plurality of laterally extending pins rotatably mounted in said aperture, 1 and a spring latch pivotally mounted on the plate adjacent the aperture, said latch having a notch adapted to receive any one of said pins, to hold the disc against rotation.

141-. In a view finder of the class described,

a member having a view aperture therein,

a perforated plate hinged tosaid member and adapted to cover said view aperture or to be swung away therefrom to allow unobstructed vision and means for holding said perforated plate in any position to which it may be turned.

15. In a view finder of the class described, a member having a view aperture therein, a perforated plate hinged to said member and adapted to cover said view aperture or to be 'swung away therefrom to allow unobstructed vision and a leaf spring frictionally engaging the perforated plate at the hinge, to hold the same in any posit-ion to which it may be turned. j 16. In a view finder of the class described, a plate vmember formed with perforations, the vperforated area of said member being similar to the exposure area of a camera with which the finder may be used, oneof said perforations being centrally located and the adjacent perforations being of diiferent size to distinguishthe center perforation.

17. In a viewfinder of the class described, a plate Ymember formed with perforations, the perforated area of said member being similar to the exposure area of a camera with which the finder may be used, one of said ,perforations being centrally located and the adjacent .perforation being smaller in size to distinguish the center perforation, forthe purpose set forth.

18. In combination with a camera, a base plate mounted on the camera, a view finder mounted on the base plate, said finder being j rotatable relatively to the camera and base plate to yanyr one of a plurality of operative positions, 'and inter-engaging means on said finder and base plate for locking said finder in any one of said opera ive positions.

19. In combination with a camera, a base plate mounted thereon and having a. plurality of apertures, a finder rotatably secured to said base plate anc. movable to any one of a plurality of operative positions, and a spring pressed latch on said finder adapted to engage one of the apertures of the base plate to lock the finder against rotation.

Q0. In combination with a camera, a base plate mounted thereon and a finder for said camera rotatably and deta chably mounted on said base plate.

21. In combination with a camera, a base plate mounted thereon having a circular aperture therein, and a finder having p0rtions slidably engaging the margin of said aperture whereby the finder is rotatably secured to the base plate.

22.' In combination with a camera, a base plate having a circular aperture therein secured to said camera, anda finder having a plurality of members extending around and slidably engaging the margin of said aperture whereby the finder is rotatably secured to the base plate, one of said members being adapted to be manipulated to disengage said marginy to permit the detachment of the finder from the base plate.

23. In combination with a camera, a base plate havinga circular opening and a finder having a plurality ofprojections for enga ing the margin of said opening, one ofsa1d projections comprising a latch for releasably connecting the nnder to the base plate.

2-1. In combination with a camera, la base plate having a circular opening and a finder having three projections for engaging the margin of said opening, two of said projections comprising hook members extending 'around 'and under said margin and the third projection comprising a rotatable latch which may be disengaged from said margin to releasably connect the iinder to the base plate. 25. In combination, a camera, a finder and means for detachably securing the finder to the camera including headed pins secured to the camera, a plate connected to the finder and having key slots, the headed pins being adapted to extend through and to have locking engagement with vsaid key slots, and a latch on said plate adapted to engage one of said pins to maintain the pins in locking position in the slots. 26. In combination, a camera, a finder and means for detachably securing the finder to the camera, said means including headed pins secured to the camera, a plate member having key slots connected to the finder, and means on said plate for maintaining said pins in locking engagement in said slots.

27. In combination, a camera, a finder, and means for detachably securing the finder to the back of the camera, said means ineluding headed pinsseeuied to the camera, a base plate to which the indei` 1s seeuied, and a plate hinged to said base plate and hzwingr key slots adapted to receive saidheaded pins, 5 and means 0n said plate for maintaining said pins in locking engagement 1n said slots.

28. In e0mhnati0n, a camera, a iindei, and i' secured to the Camera, a platey having key slots adaped to `iecekivesaid headed pins, means 0n said plate for maintaining said pins in looking engagement with said slots,

a hase plate to Whiehr the camera may he se-k L5 cured hinged at one edge to said slotted plate, and a latch on the camera for engaging and holding the opposite edge of the base plate. ln testimony whereof l aliX my signature.

.HERBERT 1a.* MCCALLUM. 

